浅谈300MW“W”火焰锅炉掺烧褐煤后的优化调整

为进一步降低发电成本,全面提高电厂的经济效益,针对300MW＂W＂型电厂锅炉的特性,以及锅炉在燃用高挥发份褐煤所表现出来的技术特点,本文提出了合理的配烧方式以及在掺配后优化调整措施,经过一年多的实践掺烧取得了良好的效果,不但保证了锅炉安全运行,而且大大提高了机组的经济效益。     

双-Keggin结构多金属氧酸盐对卤酸根离子的电催化还原

双-Keggin结构取代型稀土多金属氧酸盐K10H3[Eu（SiMo4W7O39）2].XH2O（简写为EuSiMo4W7）在水溶液中可进行一系列单电子和两电子的可逆还原过程,产生具有催化活性的杂多蓝,因此,该类化合物是良好的氧化剂和催化剂。采用循环伏安法研究EuSiMo4W7水溶液的电化学性质、扫描速度及溶液pH均对EuSiMo4W7的电化学性质有所影响,同时考察该物质对卤酸根离子还原反应的催化作用,结果表明：EuSiMo4W7对IO3-的催化作用强于对BrO3-的催化作用,而对ClO3-基本上不起催化作用,可见,EuSiMo4W7对3种卤酸根离子还原反应的催化作用按照ClO3-、BrO3-、IO3-的顺序依次增强。     

上海M50创意园区旅游开发初探

大城市老城区里的文化创意园区,因其独特的历史文化底蕴以及创意氛围而成为一个城市的地标性地段,吸引着人们前去参观游览。文章重点对上海M50创意园区进行旅游开发的优势与劣势进行了分析,发现在M50的旅游开发中,优势大于劣势,机遇大于挑战,园区进行旅游开发具有可行性;并针对M50旅游开发中存在的问题与挑战,提出了具体的开发措施。     

基于netX50芯片的Ethernet／IP接口设计

主要对工业以太网进行了初步的阐述,并提出了一种基于netX50网络控制的实现工业以太网协议Ethernet／IP通信接口的设计。该设计采用C8051F020作为主控制器,netX50作为辅助控制器,MCU通过DPM双端口内存访问netX50并实现网络通信。     

一种基于OPC技术的风电主控系统数据记录软件的开发与实现

OPC把对象链接和嵌入技术应用于工业过程控制领域,为工业控制领域提供了一种标准的数据访问机制.本文研究了OPCDA服务器和客户程序,并将OPC技术应用于风电领域常用的巴赫曼PLC控制器,利用VISUALBASIC开发了“主控系统数据记录软件”,并详细描述了该软件的使用方法,实践证明该软件在风场调试和工厂测试中得到了较好的效果.     

Determination of threshold stress intensities: fatigue of low alloy steel BS4360-50D

An experimental method for obtaining the effective stress intensities necessary for cyclic crack growth prediction is described. Also, it is shown that the critical threshold value, ΔK_{c, th}, can be estimated using simple energetic considerations, leading to an equation:

$\text{Δ}\text{K}{}_{\mathrm{c,th}}\text{=}\text{4π}\text{E}\text{λ}{}_{\mathrm{s}}\text{2?}\text{(θ}{}_{\mathrm{uts}}\text{?}{}_{\mathrm{f}}\text{)}\text{((1+}\text{n}\text{)θ}{}_{\mathrm{yc}}\text{)}{}^{\mathrm{<mtext>1</mtext><mtext>2</mtext>}}$

The threshold values obtained compare well with the experimentally observed values for a structural steel BS 4360-50D and for other steels.     

A model for fatigue crack growth in a threshold region

The prediction of fatigue crack growth at very low ΔK values, and in particular for the threshold region, is important in design and in many engineering applications. A simple model for cyclic crack propagation in ductile materials is discussed and the expression

$\text{da}\text{dN}\text{=}\text{2}{}^{\mathrm{1+n}}\text{(1?2v)(ΔK}{}^2{}_{\mathrm{eff}}\text{?ΔK}{}^2{}_{\mathrm{c,eff}}\text{)}\text{4(1+n)π σ}{}^{\mathrm{1?n}}{}_{\mathrm{yc}}\text{E}{}^{\mathrm{1+n}}\text{?}{}^{\mathrm{1+n}}{}_{\mathrm{f}}$

developed. Here, n is the cyclic strain hardening exponent, σ_yc is cyclic yield, and ε_f is the true fracture strain. The model is successfully used in the analysis of fatigue data BS 4360-50D steel.     

Worker control: A reply to Ronan.

Argues that W. W. Ronan (1980) presents a one-sided picture of "work force control" by the "entrepreneur–capitalist–management group" and discredits the contributions of many psychologists to workers' well-being. Ronan's contentions that (1) psychological concepts are applied to programs that are motivated by management's desire to avoid unionization, (2) psychological experiments and interventions are unilaterally imposed on workers by management, and (3) economic benefits of psychological interventions should be shared equally with workers are discussed. It is concluded that psychologists have every reason to be proud of their colleagues' contributions to making companies more profitable while improving the work environment for employees. (1 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effect of annealing on the characteristics of Au layers grown on the high-temperature deposited Ni50Fe50 layers

80 nm-thick Ni₅₀Fe₅₀ layers were sputter-deposited on glass substrates at 400 °C and then Au layers were sputter-deposited on the Ni₅₀Fe₅₀ layers. The Au/Ni₅₀Fe₅₀ bilayer films were annealed in a vacuum of 5×10⁻⁴ Pa from 250 to 450 °C for 30 min or 90 min. The characteristics of the Au layers were studied by Auger electron spectroscopy, field emission scanning electron microscopy, X-ray diffraction and a four-point probe technique. When the annealing temperature reaches 450 °C, Fe and Ni atoms diffuse markedly into the Au layer and the Fe content is more than the Ni content. When the annealing temperature is lower than 450 °C, the grain size of the Au layers does not change markedly with annealing temperature. However, as the annealing temperature reaches 450 °C, the annealing promotes the grain growth of the Au layer. As the annealing temperature exceeds 300 °C, the resistivity of the bilayer films increases with increasing annealing temperature. The diffusion of Fe and Ni atoms into the Au layer results in an increase in the resistivity of the annealed bilayer film. Large numbers of Fe and Ni atoms diffusing into the Au layer of the annealed Au/Ni₅₀Fe₅₀ bilayer film lead to a significant decrease in the lattice constant of the Au layer.     

Simultaneous recrystallization, phosphorous diffusion and antireflection coating of silicon films using laser treatment

Laser technique application to polycrystalline silicon thin-film solar cell fabrication on glass substrates has received appreciable attention. In this paper, a laser-doping technique is developed for plasma-deposited amorphous silicon film. A process involving recrystallization, phosphorous diffusion and antireflection coating can be achieved simultaneously using the laser annealing process. The doping precursor, a phosphorous-doped titanium dioxide (TiO₂) solution, is synthesized using a sol-gel method and spin-coated onto the sample. After laser irradiation, the polycrystalline silicon grain size was about 0.5∼1.0 μm with a carrier concentration of 2 × 10¹⁹ cm^− 3 and electron mobility of 92.6 cm²/V s. The average polycrystalline silicon reflectance can be reduced to a value of 4.65% at wavelengths between 400 and 700 nm, indicating the upper TiO₂ film of antireflection coating.